Just a note for future visitors to this thread, the changelog for each release can be found on the download page for the product, see attached image. See this page, for example: https://www.eset.com/ca/business/endpoint-security/windows-security/download/
Another way to get notified of new ESET product releases is to subscribe to email alerts for "ESET Knowledgebase Support News", which will email you when an update is released along with the changelog. However, this isn't perfect since it includes all ESET products, you can't filter for the specific products in your environment.
https://support.eset.com/news/?locale=en_US